What has lots of eyes, but can’t see?

The doctor advised his patient to take a tablet after every fifteen minutes. He gave him five tablets in total.

How much time will he take to have all the five tablets?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

What does the below rebus riddle means?

I have two coins.
* One of the coins is a faulty coin having a tail on both sides of it.
* The other coin is a perfect coin (heads on side and tail on other).

I blindfold myself and pick a coin and put the coin on the table. The face of the coin towards the sky is the tail.

What is the probability that another side is also tail?

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.

With pointed fangs I sit and wait; with piercing force I crunch out fate; grabbing victims, proclaiming might; physically joining with a single bite. What am I?

What is the coolest letter in the alphabet?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?